Fkank capello



F. CAPELLO.

FUSE PLUGF APPLICATION FILED SEPT. 20, 1941.

.1 3 1 3, 67 1 Patented Aug". 19. 1919.

Inventor: v Frank Capelio,

by WWW His fittorneg smrnsrrrnnr orrrcn FRANK CAPELLO, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK. i

FUSE-PLUG.

Specification or Letters Patent.

Application filed September 20, 1917. Serial No. 192,401.

To all whom it may concern:

Be it known that I, F RANK'CAPELLO, a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain new and useful Improvements in Fuse- Ilugs, of which the following is a specification.

This invention relates to thermal cutv soldered first to the outer ring and then,

after assembly, to the central contact memher. This brazing or soldering particularly to the central contact member, required some little care and precision in order to secure a good contact.

The use of too much solder in the soldering process was likely to impair the fusing qualities of the fusible element by causing it to partially melt away or to crystallize.

Again the use of too much acid in the soldering process would cause corrosion of the fusible element to go on for some time after assembly thus gradually impairing the fusible element of a supposedly good fuse plug or destroying the contact.

In the practice of my invention the exercise of such care is no longer necessary because I have devised means for securing the fusible element, particularly to the central contact member, without the use of solder, or acid by pressin it against the contact by some readily defbrmable conducting substance or material such as a lead pellet or shot. 'To this end I have so shaped the central contact member that it will receive one end of the fusible element and it is then pressed into conducting relation with the contact member by deforming and expanding the conducting substance inserted by some suitable tool. Securing the fusible element in this manner forms a permanently good contact Without in any way injuring the fusible element in the process of assembly and without the employment of deleterious acids. Such connections can be more quickly and certainly made than soldered connections and require the exercise of less skill.

For a more complete understanding of my invention reference may be had to the following detailed description taken in connection with the accompanying drawing in which Figure 1 is a side elevation ofan assembled fuse plug made in accordance with my invention; Fig. 2 shows the parts Patented Aug. 19, 1919.

of such a fuse plug in dis-assembled relation while Fig. 3 is a section of the assembled fuse plug shown in Fig. 1.

In the drawings, 5 denotes a cup-shaped base formed of suitable insulating material, such as molded porcelain, on the lower or tapered end of which is fitted the screw threaded conducting shell 6 having secured" thereto one end of the fusible element 7.-

The fusible element 7 is inserted in'the recess 8 formed in the base 5 and is then bent over the bridge 9, which is also formed in the base 5, to be fastened to the central contact member 10.

The central contact member 10 isv shaped to receive one end of fusible element 7 and so has an annular or tubular ortion- 11 adapted to be inserted in a per oration in -the.lower portion of the base 5 and there be spun or up-set so as to secure it to the base and also to secure the insulating or porcelain washer 12 on the lower end of' the base 5.

The free end of fusible element 7 is inserted in the tubular portion 11 of the central contact member and is pressed into conducting relation therewith by a slug of readily deformable conducting substance 13, which in the instance shown 'comprises a lead shot adapted to be pressed into place in the base of the tubular portion of member 10 with any suitable tool by the person assembling the parts of the fuse plug.

The shot 13 is expanded by such pressure, to fill the lower portion of the tubular con tact member 10 so as to secure a good contact therewith and enabling the fuse plug to carry its rated current without undue resistance atthe joints. I

While I have described in detail the best means at present known to me for carrying out an embodiment of my invention 1 would have it; understood that they are merely illustrative and that do not mean to be limited to the exact details shown nor in the choice of equivalents except as set forth in my claims hereunto appended.

'What I claim as new and desire to secure by Letters Patent of the United States, is:

1. In a fuse plug, the combination with an insulating base having an annular con-- ductingmember and a central contact memher one of which members is provided with a cavit of a fusible clement entering said cavity, and a slug of conducting material arranged in said cavity and deformed to press said fusible element into conducting relation with one of said members.

2. In a fuse plug, the combination with an insulating base having a conducting shell and a central contact member provided with a cavity, of a fusible element secured at one end to said shell, and the other end entering said cavity, and a conducting slug deformed in said cavity to press said fusible element into conducting relation with said central contact member.

3. In a fuse plug, the combination with an insulating base having a conducting shell and central contact member, of a fusible element secured at one end to said shell, said central contact member being formed with a cavity to receive the other end of said fusible element, and a slug located in said cavity and deformed therein to press the last said end into conducting relation With said central contact .memben 4.111 a fuse plug, the combination with an insulating base having a conducting shell and central contact member, of a fusible element secured at one end to said shell said central contact member having a tubular portion adapted to receive the other end of said fusible element and a deformable slug inserted in said tubular portion and upset therein to press the last said end into conducting relation with said central contact member.

5. In a fuse plug, the combination with an insulating; base having; a conducting shell and central contact member, offa fusible element secured at one end to said shell, said central contact member having a tubular portion for receiving the other end of said fusible element and deformable conducting substance pressed into said tubular portion for retaining the last said end in conducting relation With said central contact member.

6. In a fuse plug the combination With a molded porcelain base havinga screw threaded Conducting shell, an insulating Washer and a central tubular contact up-set interiorly of .base to secure said Washer thereto; of a fusible element secured at one end to said shell, the other end being inserted in said tubular contact and a pellet of conducting material. pressed into said tubular contact for securing said fusible element thereim Tv The combination of a metallic conductor having therein a cavity wi h, side and end Walls, a. second metallic conductor entering said cavity, and a deformable metallic part expanded in said cavity adjacent its end Wall and pressing the conductor therein against the side Wall thereof.

In Witness whereof, I have hereunto set my hand this 19th day of September, 1917,

FRANK GAPELLO. 

